A measure of electric charge, defined as the quantity carried by one ampere of current in one second. Its symbol is "C", and it is named after a French physicist who explored electrical forces.

Coulomb

A measure of electric potential difference, expressed as energy per unit charge. Its symbol is "V", and it is named after an Italian physicist and inventor who developed early electric batteries.

Volt

A measure of force, described as the amount required to accelerate a mass of one kilogram at a rate of one meter per second squared. Its symbol is "N", and it honors an English physicist famous for the laws of motion.

Newton

A measure of electrical conductance, quantifying the ease with which an electric current passes through a material. Its symbol is "S", and it honors a German inventor known for contributions to electrical engineering.

Siemens

The measure of capacitance, which quantifies a system's ability to store electric charge. Its symbol is "F", and it is named after an English scientist known for groundbreaking work in electromagnetism.

Farad

A measure of luminous intensity, describing the power of visible light emitted in a particular direction. It has a symbol "cd" and is based on the light emitted by a standard source.

Candela

The fundamental measure of time, defined as the duration of 9,192,631,770 vibrations in the cesium-133 atom's ground state. This precise standard has a symbol "s" and is essential for scientific measurements and daily life.

Second

The measure of energy or work, equivalent to applying a one-newton force over a one-meter distance. It has a symbol "J" and is named after an English physicist who studied energy transfer.

Joule

The measure of dose equivalent, which adjusts absorbed radiation dose by the biological effects on tissues. Its symbol is "Sv", and it honors a Swedish physicist in medical physics.

Sievert

The measure of thermodynamic temperature, anchored to the fundamental constant of energy per particle. Its zero point represents the absence of thermal motion. The unit’s symbol is "K", and it is named after a British physicist.

Kelvin